Yeah 26 would ramp up quicker than 24.
Going to 2.5id from 3mm id would decrease the amount of wire in your build and help on the ramp up, dont discount 2.5mm id, i used it lots at really high watts for ages(150-200w), i like it on certain atty's and it will also give you a little more flavour although you will have to drip a little more often.